refactor: migrate PileType → KlondikePile across core/wasm/engine

- Replace PileType with typed KlondikePile (Foundation/Tableau variants)
  throughout solitaire_core, solitaire_wasm, and solitaire_engine;
  ReplayMove now uses SavedKlondikePile for serialisation stability
- Split replay_overlay.rs into replay_overlay/ module (mod, format,
  input, update, tests) for maintainability
- Add klondike dep to solitaire_engine and solitaire_data Cargo.toml
- Add TestPileState infrastructure to game_state.rs for engine unit tests
- Rebuild solitaire_wasm pkg (js + wasm artefacts updated)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

solitaire_engine/src/auto_complete_plugin.rs

@@ -151,9 +151,9 @@ mod tests {
     use super::*;
     use crate::game_plugin::GamePlugin;
     use crate::table_plugin::TablePlugin;
-    use solitaire_core::card::{Card, Rank, Suit};
+    use klondike::{Foundation, KlondikePile, Tableau};
+    use solitaire_core::card::{Rank, Suit};
     use solitaire_core::game_state::{DrawMode, GameState};
-    use solitaire_core::pile::PileType;
 
     fn headless_app() -> App {
         let mut app = App::new();
@@ -166,31 +166,45 @@ mod tests {
         app
     }
 
-    /// Build a nearly-won game: one Ace of Clubs in Tableau(0), all other
-    /// tableau piles empty, stock/waste empty, Clubs foundation empty.
-    fn nearly_won_state() -> GameState {
-        let mut g = GameState::new(42, DrawMode::DrawOne);
-        g.piles.get_mut(&PileType::Stock).unwrap().cards.clear();
-        g.piles.get_mut(&PileType::Waste).unwrap().cards.clear();
-        for i in 0..7 {
-            g.piles
-                .get_mut(&PileType::Tableau(i))
-                .unwrap()
-                .cards
-                .clear();
+    fn seeded_state_with_auto_move() -> (GameState, (KlondikePile, KlondikePile)) {
+        let mut g = GameState::new(1, DrawMode::DrawOne);
+        g.set_test_stock_cards(Vec::new());
+        g.set_test_waste_cards(Vec::new());
+        for foundation in [
+            Foundation::Foundation1,
+            Foundation::Foundation2,
+            Foundation::Foundation3,
+            Foundation::Foundation4,
+        ] {
+            g.set_test_foundation_cards(foundation, Vec::new());
         }
-        g.piles
-            .get_mut(&PileType::Tableau(0))
-            .unwrap()
-            .cards
-            .push(Card {
-                id: 99,
+        for tableau in [
+            Tableau::Tableau1,
+            Tableau::Tableau2,
+            Tableau::Tableau3,
+            Tableau::Tableau4,
+            Tableau::Tableau5,
+            Tableau::Tableau6,
+            Tableau::Tableau7,
+        ] {
+            g.set_test_tableau_cards(tableau, Vec::new());
+        }
+        g.set_test_tableau_cards(
+            Tableau::Tableau1,
+            vec![solitaire_core::card::Card {
+                id: 7_001,
                 suit: Suit::Clubs,
                 rank: Rank::Ace,
                 face_up: true,
-            });
+            }],
+        );
         g.is_auto_completable = true;
-        g
+        let expected = (
+            KlondikePile::Tableau(Tableau::Tableau1),
+            KlondikePile::Foundation(Foundation::Foundation1),
+        );
+        assert_eq!(g.next_auto_complete_move(), Some(expected));
+        (g, expected)
     }
 
     #[test]
@@ -202,8 +216,9 @@ mod tests {
     #[test]
     fn detect_activates_when_auto_completable() {
         let mut app = headless_app();
-        // Install a nearly-won state and fire StateChangedEvent.
-        app.world_mut().resource_mut::<GameStateResource>().0 = nearly_won_state();
+        let mut g = GameState::new(42, DrawMode::DrawOne);
+        g.is_auto_completable = true;
+        app.world_mut().resource_mut::<GameStateResource>().0 = g;
         app.world_mut().write_message(StateChangedEvent);
         app.update();
 
@@ -213,7 +228,8 @@ mod tests {
     #[test]
     fn drive_fires_move_request_when_active() {
         let mut app = headless_app();
-        app.world_mut().resource_mut::<GameStateResource>().0 = nearly_won_state();
+        let (g, (expected_from, expected_to)) = seeded_state_with_auto_move();
+        app.world_mut().resource_mut::<GameStateResource>().0 = g;
         app.world_mut().write_message(StateChangedEvent);
         app.update(); // detect runs, sets active
 
@@ -229,16 +245,15 @@ mod tests {
         let fired: Vec<_> = cursor.read(events).collect();
         // At least one MoveRequestEvent should have been fired.
         assert!(!fired.is_empty(), "expected at least one MoveRequestEvent");
-        assert_eq!(fired[0].from, PileType::Tableau(0));
-        // First empty foundation slot wins on a fresh nearly-won board.
-        assert_eq!(fired[0].to, PileType::Foundation(0));
+        assert_eq!(fired[0].from, expected_from);
+        assert_eq!(fired[0].to, expected_to);
     }
 
     #[test]
     fn drive_deactivates_on_win() {
         let mut app = headless_app();
         // Inject a won game state — active should not be set.
-        let mut gs = nearly_won_state();
+        let (mut gs, _) = seeded_state_with_auto_move();
         gs.is_won = true;
         app.world_mut().resource_mut::<GameStateResource>().0 = gs;
         app.world_mut().write_message(StateChangedEvent);